My mom had this same problem with her 94 850 for a year now. She had a complete tune-up and it still happened. She took the car back to her mechanic and he checked out everything again. Of course the stalling did not happen when he had the car. He told her to put 6 cans of dry gas into the gas tank. I laughed but it worked!!!!! Her car hasn't stalled in 7 months. Don't know if this will help you, but it sure helped her!!!!!